<template>
  <div id="home">
    <nav-bar class="home-nav">
      <div slot="center">购物街</div>
    </nav-bar>
    <tab-control
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl1"
        class="tabControl"
        v-show="isTabFixed"
      />
    <scroll
      class="content"
      ref="scroll"
      :probeType="3"
      @scroll="contentScroll"
      :pullUpLoad="true"
      @pullingUp="loadMore"
    >
      <home-swiper :banners="banners" @swimgLoad='swimgLoad'></home-swiper>
      <recommend-view :recommends="recommends"></recommend-view>
      <home-feature />
      <tab-control
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      />
      <goods-list :goods="showGoods"></goods-list>
    </scroll>
    <back-top @click.native="backClick" v-show="isShow"></back-top>
  </div>
</template>

<script>
import NavBar from "@/components/common/navbar/NavBar.vue";
import TabControl from "@/components/content/tabControl/TabControl.vue";
import Scroll from "../../components/common/scroll/Scroll.vue";
import BackTop from "@/components/content/backtop/BackTop.vue";

import GoodsList from "@/components/content/goods/GoodsList.vue";
import HomeSwiper from "./childComps/HomeSwiper.vue";
import RecommendView from "./childComps/HomeRecommendView.vue";
import HomeFeature from "./childComps/HomeFeature.vue";

import { getHomeMultidata, getHomeGoods } from "@/network/home.js";
import { debounce } from "@/common/utils.js";

export default {
  name: "Home",
  components: {
    NavBar,
    HomeSwiper,
    RecommendView,
    HomeFeature,
    TabControl,
    GoodsList,
    Scroll,
    BackTop,
  },
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      isShow: false,
      tabOffsetTop:0,
      isTabFixed:false,
      saveY:0
    };
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    },
  },
  created() {
    // 1.请求多个数据
    this.getHomeMultidata();

    // 2.请求商品数据
    this.getHomeGoods("pop");

    this.getHomeGoods("new");

    this.getHomeGoods("sell");
  },
  mounted() {
    // 监听图片加载
    const refresh = debounce(this.$refs.scroll.refresh, 500);
    this.$bus.$on("imgLoad", () => {
      refresh();
    });
    // // 监听图片加载
    // this.$bus.$on('imgLoad',() => {
    //   // 这样写调用refresh过于频繁
    //   console.log('11111');
    //   this.$refs.scroll && this.$refs.scroll.scroll.refresh()
    // })
  },
  activated(){
    // 活跃
    this.$refs.scroll.refresh
    this.$refs.scroll.scrollTo(0,this.saveY,3)
    // console.log('222');
    
  },
  deactivated(){
    // 离开
    this.saveY=this.$refs.scroll.scroll.y
    // console.log(this.$refs.scroll.scroll.y);
  },
  destroyed(){
    console.log('111');

  },
  methods: {
    // 网络请求相关方法
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;
        // 完成了上拉加载更多
        this.$refs.scroll.finishPullUp()
      });
    },

    // 事件监听相关方法
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentIndex=index
      this.$refs.tabControl2.currentIndex=index
      if(this.isTabFixed){
        this.$refs.scroll.scrollTo(0,-this.tabOffsetTop,0)
      }
      
    },

    contentScroll(position) {
      // 1.判断backTop是否显示
      this.isShow = position.y < -1000;
      // 2.决定tabControl是否吸顶（position：fixed)
      this.isTabFixed = -position.y>this.tabOffsetTop
    },

    backClick() {
      // 拿到上面scroll对象中的scroll属性
      // console.log(this.$refs.scroll.aaa);
      this.$refs.scroll.scrollTo(0, 0, 500);
    },

    loadMore() {
      this.getHomeGoods(this.currentType);
    },


    // 获取tabControl的offsetTop
    // 所有的组件都有一个属性 $el  获取组件内的元素
    swimgLoad() {
      this.tabOffsetTop=this.$refs.tabControl2.$el.offsetTop
    },
    
    
  },
};
</script>

<style lang="css" scoped>
#home {
  height: 100vh; /*vh:视口;*/
  /* padding-top: 44px; */
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
  /* position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 9; */
}


.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}

.tabControl{
  position: relative;
  z-index: 9;
}
/* .content {
  height: calc(100% - 93px);
  
  margin-top: 44px;
} */
</style>